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Question

Which of the following transmission medium is immune from electromagnetic interference

A
Category 3 shielded cable
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B
Optical fibre
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C
Coaxial cable
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D
Category 5 twisted cable
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Solution

The correct option is B Optical fibre

Optical fibre transmission medium is immune from electromagnetic interference.

Optical Fibre Is Immune To EMI. ... As a result, they are immune to Electro-Magnetic Interference and Radio Frequency Interference. In other terms, the integrity of signals is not affected by electrical noise in the environment. In copper cables, the integrity of signals can be affected by electrical noise.

Fiber Optics will lead a high cost of physical medium and compatible devices. ... Disadvantages are almost all installation based, once installed fibre connections are superior to traditional copper cables due to immunity from electromagnetic interference and much higher available bandwidth.

Magnetic field lines generate an electrical current as they cut across conductors. ... Electromagnetic Interference does occur in coaxial cables, since current does cut across the conductor. Fiber optics are immune to this EMI since signals are transmitted as light instead of current.

Light from semiconductor (III-V) laser diodes is used as a carrier for optical fiber communication. Usually the wavelength of this light is in range 1.3-1.6 µm (infrared), which is invisible to bare eyes.


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